Sheet filter



A ril 6, 1937. G. H. SEITZ 2.076,049

SHEET FILTER Filed Nov. 14. 1935 2 Sheets-Sheet 1 IN VENT OR. Gas-ole G fi-wwe/qv/ 65/ 72 I ATTORNEYS p i 6, 19 1 G. H sEl Tz 2,076,049

SHEET FILTER Filed Nov. 14, 1936 2 Sheets-Sheet 2 INVENTOR. GEOGG bwve/w/ S51 2 oRNEYs Paten ted Apr. 6, i937- PATENT- OFFICE SHEET FILTER Georg Heinrich Seitz, Bad Kreuznach, Germany Application November 14, 1936, Serial No. 110,:0'1

ermany March 22, 1932 g, i

In G

. 1 Claim.

This invention relates to filters and relates more particularly to filter presses comprising a large number of angular frames clamping thin filter sheets situated between these frames, the liquid to be filtered being 'supplied to the filter sheets through a channel formed by the assembly of the filter frames and being removed from the filter sheets through another channel formed by the said assembly. 7

The present application is a continuation-inpart of my co-pending patent application relating to Filter presses, filed July 20, 1935, Serial Number! 32,413. I

An object of the present invention is the provision of a simple and efiiciently operable filter,

shown in Figure 1.

the filter sheets of which are always maintained in their proper relative positions.

. The above and other objects of the present invention may be realized by providing a filter which comprises a plurality of filter frames, a plurality of filter sheets interposed between the frames, means for clamping the assembled frames and sheets, and a support for the filter sheets, which support may be attached to the filter frames, to the main frame supporting the entire assembly or to the drip pan situated underneath the filter frames and the filter sheets. This support is used for maintaining the filter sheets in their proper positions relatively to the filter frames before the frames are pressed against each other to clamp the filter sheets.

The invention will appear more clearly from the following detailed description when taken in connection with the accompanying drawings showing, by way of example, preferred embodiments of the inventive idea.

In the drawings:

Figure 1 is a perspective view of a filter haying supporting means connected to its main frame.

Figure 2 is a cross-section through the filter,

Figure 3 is a longitudinal vertical section, through the filter shown in Figure 1, and partly a side elevation.

Figure ,4 is a detail cross-section through a filter the supporting means of which are con-' nected in the drip pan. v

Figure 5 is a section along the line 5-5 of Figure 4, on a larger scale.

Figure 6 is a perspective view of a filter frame equipped with filter sheet supporting means; and

Figure '7 is a detail longitudinal section through a filter composed of filter frames shown in Fig-- ure6. p

-jacent fi lter frames l1 .and is The filter press shown in Figures 1, 2 and 3 of the drawings, comprises a main frame 8 which is provided with horizontal bars 9' preferably supported upon wheels l0. Two vertical bars I l support an end frame I2 which is integral with the bars ll. A second end frame l3 carries rollers I4,

one of which is shown in Figure 1, and is supported upon horizontal rails or bars l5 which are carried by the vertical bars II and 16.

The device comprises a large number of filter frames I! which are clamped between the end frames I2 and I3 when the filter is being operated. Each filter frame I1 is provided with a. pair of lateral triangular projections [8 having curved lower surfaces which fit over the surfaces of the round bars l5. Due to this arrangement the filter frames H are suspended upon the bars l5 and may be shifted along these bars. 4

The clamping means used for clamping the filter frames l'l comprise a boss l9 connected by the web 20 with the vertical supports IS.- The inner surfaces of the boss l9 are threaded and mesh with the screw threads of a lead rod 2| one end of which carries a hand wheel 22. The opposite end of the lead rod 2| is rotatably held within a socket 23 constituting an integral part of the end frame 13.

A drip pan 24 is situated underneath the filter frames l1 and is carried by two bars 25 which extend between the vertical bars II and I6 and are firmly connected therewith.

Filter sheets '26 are interposed between the filter frames l1 and are firmly clamped between these frames when the filter is being operated. As shown in Figure 2, each filter sheet 26 consists of a thin squarepiece made of a filter material.

The filter sheets 26 are supported by two parallel horizontal bars 21 the adjacent ends of which are suspended from a cross-plate 28 situated between the two vertical bars l6. and firmly connected therewith. The opposite ends of the bars 21 are connected to the end frame l2. The bars 21 extend directly underneath the filter frames l1 and serve as a gauge and support for each filter sheet'26 when it is inserted between two adjacent filter frames I'I, its lower edge rest I ing upon the bars 21.

, When the filter is not being used, the end frame I3 is situated at such distance from the end frame l2, that the filter frames l'l may be moved freely upon the bars l5. A separate filter sheet 26 is situated in each space between two adcarried by the bars 21. In. order to clamp the filter sheets 26,

- the operatorrotftestiie hand wheel 22 thereby jections 29 which fit one into the other to form passages for the turpid liquid and for the clear filtered liquid. A wire net may besituated within the interior of each filter frame. The channels communicate with the interiors of the filter frames in such manner that the turpid liquid to be filtered is supplied to the interiors of. alternate frames and that the clear filtered liquid is removed from the interiors of the remaining 1. e.

other alternate frames. As indicated in Figure 3, the filter frames I! are arranged in such manner that two cylindrical projections 22 of two filter frames fit over an edge of an intermediate filter frame the cylindrical projection 35 which is situated at the opposite side of the ter. Due to the provision of the bars 21, each of the filter sheets 26 is maintained in its proper position relatively to the filter frames vll at all stages of preparatory and 'final assembly. After the completion of the filtering operation and the withdrawal of the end frame 13, the filter sheets 26 are again supported by the bars 21 and may 3e scraped or cleaned while they are in that posion. Y

The filter shown in Figures 4 and 5 of the drawings comprises an end frame l2 carried by a vertical bar II and filter frames ll carried by a bar 15 connected to the main frame ofv the-filter. A drip pan 2! is situated underneath the filter frames I1 and is carried by a bar 25 connected to the vertical bar ll. Filter sheets .28 which are interposed between the filter frames II are carried by a bar or support 30 the angular end brackets 3| of which are firmly connected to the opposite side walls of the drip pan 24.

The filter shown in Figures 6 and 7 comprises filter frames 32 carrying sheets ofwiring 83 and supported by projections I 8 upon the bars of the main frame. Each of the filter frames 32 carries two horizontal lugs 34 which are firmly connected or integral with the filter frame. These lugs 34 support the filter sheets 26 which are interposed between the filter frames 32.

The lugs may project beyond both of the vertical surfaces of each frame in view of the com- --mon usage of reversing the filter frames and may be located at different distances from the lateral edges of the filter frames.

While filter sheets of square contour possess definite advantages, such as the possibility of using simple supp rting means and of reversing the filter sheets along withthe filter frames, in addition to the saving of filter material and the provision of maximum filtering surfaces, filter sheets of polygonal contour other than square, and circular filter sheets may also be conveniently employed.

What is claimed is:

A filter, comprising in combination a plurality of filter frames situated side by side, each filter frame comprising twoprojections situated on opposite sides of the frame and at least two sleeves, a plurality of filter sheets, each filter sheet being situated between two adjacent filter frames, a main frame having at least two bars 

